Fortune Brainstorm Green 2011 is looking forward to a more sustainable future. More companies are learning to better balance on the three pillars that encapsulates what many consider a sustainable company: Economic, Environmental, and Socially Responsible. Over the past three days, the leading knowledge movers and shakers of the Fortune 500 world, along with NGOs and entrepreneurs, shared their thoughts on whether or not the sustainable glass is half full, half empty – or if it just doesn’t seem to be carrying enough water. Read ahead for the highlights.

At the close of day 1, Richard Branson announced his new underwater adventure and made some comments sharing his half-empty perspective on the demand for fuel: “We did a lot of research on when the demand for fuel will exceed supply and we put out a report every year. And it’s frighteningly soon. And when that happens, we can easily see fuel going to $200 a barrel… So I think that everybody in this room has got to work extremely hard- not just with global warming but with ways of saving energy as fast as possible… otherwise we’re going to have the mother of all recessions.”

He also noted the role of corporations solving problems versus the government: “I think the problem today is that I think you can’t rely on governments to sort out problems…. you can see how difficult it is to govern America…. Therefore, I think it’s up to corporations to get on and do the job. ”